Preheat the oven to 350˚ F. Bring a large pot of water to boil. Cook the pasta according to the package directions until just shy of al dente. Drain well. Meanwhile, lightly grease standard size muffin pans with cooking spray. In a medium bowl, combine the cracker crumbs, ½ cup of the shredded cheese, and melted butter and mix with a fork until combined. Spoon a bit of the mixture into the bottom of each muffin well and tamp down with the flat bottom of a glass or other.

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Once the pasta is cooked and drained, add it to a large mixing bowl with the remaining shredded cheese, the boursin and cold butter. In a liquid measuring cup, combine the eggs, milk, and sour cream and whisk to combine. Add the liquid mixture to the bowl with the pasta. Stir in the salt and red pepper flakes and mix until evenly combined.

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Divide the macaroni mixture between the prepared muffin wells. Bake until light golden, about 20-25 minutes. Let cool in the muffin pans at least 10-15 minutes, then carefully remove from the pan and serve warm.